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Record Warmth Lingers; Fire Weather Concerns; Unsettled Pacific Northwest

More record warm temperatures are forecast this week from California, Southwest, Plains then into the Mississippi Valley and Southeast. The warmth combining with dry conditions may result in elevated to locally critical fire weather conditions. Meanwhile, another Pacific system will move across the Pacific Northwest with lower elevation rain and mountain snows. For Hawaii, conditions improving. Read More >

Current conditions at

Sunnyside Municipal Airport (K1S5)

Lat: 46.3271°NLon: 119.9704°WElev: 768.0ft.

Clear

N/A

Humidity 87%
Wind Speed N 0 MPH
Barometer NA
Dewpoint N/A
Visibility 10.00 mi
Last update 10 Mar 07:35 AM PDT
Extended Forecast for

Prosser WA

  • Overnight

    Overnight: Mostly cloudy, then gradually becoming mostly clear, with a low around 38. West wind 3 to 5 mph.

    Low: 38 °F

    Decreasing
    Clouds

  • Monday

    Monday: Increasing clouds, with a high near 63. Light and variable wind becoming south around 5 mph in the afternoon.

    High: 63 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Cloudy, with a low around 45. South wind around 6 mph.

    Low: 45 °F

    Cloudy

  • Tuesday

    Tuesday: Rain likely, mainly after 11am. Cloudy, with a high near 61. Southwest wind 5 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 61 °F

    Rain Likely

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain before 11pm. Mostly cloudy, with a low around 42. West wind around 14 mph, with gusts as high as 22 mph.

    Low: 42 °F

    Chance Rain
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of rain after 11am. Mostly sunny, with a high near 58.

    High: 58 °F

    Slight Chance
    Rain

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 34.

    Low: 34 °F

    Clear

Detailed Forecast

Overnight
Mostly cloudy, then gradually becoming mostly clear, with a low around 38. West wind 3 to 5 mph.
Monday
Increasing clouds, with a high near 63. Light and variable wind becoming south around 5 mph in the afternoon.
Monday Night
Cloudy, with a low around 45. South wind around 6 mph.
Tuesday
Rain likely, mainly after 11am. Cloudy, with a high near 61. Southwest wind 5 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
A 40 percent chance of rain before 11pm. Mostly cloudy, with a low around 42. West wind around 14 mph, with gusts as high as 22 mph.
Wednesday
A 20 percent chance of rain after 11am. Mostly sunny, with a high near 58.
Wednesday Night
Mostly clear, with a low around 32.
Thursday
Sunny, with a high near 57.
Thursday Night
Clear, with a low around 34.
Friday
Mostly sunny, with a high near 61.
Friday Night
Partly cloudy, with a low around 38.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Mostly sunny, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Prosser WA
 46.21°N 119.75°W (Elev. 741 ft)
Last Update:
10:15 pm PDT Mar 22, 2026
Forecast Valid:
12am PDT Mar 23, 2026-6pm PDT Mar 29, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation